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JLR-7700 MK2 GPS Navigator
North
Starting point
(origin)
Planned route
CMG
VTD
Current position
Destination
North
c
V (vessel speed)
a
VTD = V cos a
VAR = V cos b
CMG = c
b
VAR
・ VTD (Speed of the destination component)
VTD (An acronym of “Velocity Toward destination”)
This in an index that shows how fast the boat is approaching toward the destination in the unit of knot
when it is navigating at a given bearing angle and speed.
・ VAR (Speed of the COG component)
VAR (An acronym of “Velocity Along Route”)
This in an index that shows how fast the vessel is approaching along the planned route in the unit of knot
when it is navigating at a given course and speed.
・ CMG (Average bearing)
CMG (An acronym of “Course Made Good”)
The bearing angle to the current position when viewed from the starting point.
Terminology
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